Grain-grinding mill.



A. T. HARE. GRAIN GRINDING M|LL. APPLICATION FILED DC.26. I916.

Patented Mar. 11, 1919.

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A. T. HARE.

GRAIN GRINDING MILL. APPLICATION FILED DEC .26. 1916.

1,296,797. Patented Mar. 11,1919.

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ASBERY 'r. HAnn, or BAInnY'ron, ALABAMA,

GRAIN-GRINDING MILL.

Specification of Letters Patent.

Patented Mar. 11, 1919.

Application filed December 26, 1916. Serial Ito-138,934.

To all whom it may concern Be it known that I, ASBERY T. HARE, a citizenof the United States of America, residing at Baileyton, in the county ofCullman and State of Alabama, have invented certain new and usefulImprovements in Grain-Grinding'Mills, of which the following is aspecification.

My invention relates to a mill for crushing and grinding corn and othergrain.

One distinctive feature of my invention relates to the structure of theframe work of the mill. This is formed in three parts comprising a baseor bed and two frames position where they can be most conv'en- Y ientlydressed. 7

Another feature of my invention relates to the manner in which thestones are adjusted. This I accomplish by drawing the stone carryingframes together by four cross'bolts carrying inner adjustable stops andend nuts by means of which the frames can be set with the grinding facesof the stones in contact throughout, after which, by means of a setscrew acting on the outer end of the mandrel of the running stone, thelatter can be allowed to recede the desired distance from the bed stone.This spacing of the stones is preferably accomplished'by means of aspring acting on the mandrel to force it against said set screw.

Another important feature of my invention has for its obj ectto largelyincrease the capacity of the mill and the quality of the meal or flourwithout increasing the runnin speed of the stones or the power requiredto drivethem. This I accomplish by providing in the eye of the bedstone, through which the grain is fed, a crushing means comprisingmetallic crushing elements which deliver crushed grain to the stoneswhich finish the grinding. I thus rely upon a metallic crusher incombination with rinding stones, as a finishing means, for obtainingsuch improved results.

Another feature of my invention relates to the means provided formaintaining the balance of the running stone, this being accomplished byrecesses formed in the back thereof and carrying radial screws Withtenance of the smooth running of the moving stone isimportant inpreserving univ formity in the grinding of the mill,

My invention further comprises the novel detail of construction andarrangements of parts, which in their preferred embodiment only areillustrated in the accompanying drawings, in which Figure 1 shows themill in side elevation with the parts in operating position.

Fig. 2 is a similar view showing the stone frames opened out.

Fig. 3 is a longitudinal vertical section taken along the center line ofthe mill.

Fig. 4 is an end elevation looking toward the running stone and with theframe broken away to illustrate the stone balance weights.

Similar reference numerals refer to similar parts throughout thedrawings.

In the preferred embodiment of my invention illustrated in the drawings,I show a'base in the form of a flat bed plate 1 formed preferably ofheavy cross connected t1mbers having attached along each 'outer sideedge thereof a metal plate or strap 2',

in one end of each of which is provided an "elongated slot 3 disposedabove the level of the frame and in the otherend of each of which isprovided an opening'to receive a pivot pin. The means for directlysupporting the running stone comprise two similar' frames 4 and 5 whichare reversely disposed, the frame 4; comprising oneach side bottommembers 6 which are adapted to be received between the side plates 2 andto be pivotally and adjustably connected to said plates at their outerends by a transverse pivot pin 7 inserted through the slots 3 andthrough bearings 8 in the ends of the bottom members 6. This pivot pinis easily removable and provided for the ready detachment for the frame4, and the pin being free to slide back and forth in the slots 3,permits the frame to be adjusted lengthwise of the base 1. The bottommembers 6 of the frame 5 carry bearing at their outer ends similar tobearings 8 and receive a ivot pin 9 which will have its ends mounted toturn in the holes in the side plates 2 able to provide for the readydetachment of the frame 5.

The frame 5 is braced on each side by uprights 10 and longitudinal'bars11, which latter bars, when the frame is horizontally membersand whichis easily remov- I disposed, is of sufficient length to support itsupper surface in substantially horizontal 7 position. This frame alsocompris'es'a transverse bearlng member 12 and parallel w th a the sameis a second bearing 'member' 13 mounted in the uprights 10. These bear-7 ing members respectively carry bearings 14 and 15, the latter of whichis elongated to on, a bearing member 13? of the frame 4.

This latter frame comprises members 10.

and ll similar to 10 and 11. The extension mandrel extends beyondthe'bearing 24 and has a socket in its end which receives a taper stud25 on a pivoted spring 26 which 7 normally engages the shaft and pressesit V inwardly. The spring is pivoted to the frame 4 and ,is free to beswung away from the extension mandrel when desired. This extensionmandrel also carries a cam 27, which through rocker elements 28 willshake ,the feed trough 29 and deliver the grain through an air blastduct30 into the top opening 31 in the outer end of a concave metalliccrusher casing 32 which is rigidly secured in position in the, eye ofthe bed stone, and through the axial center of which passes the mainmandrel 18 carrying fixed thereona metallic cone crusher, both theconcave and the cone carrying co-acting burs or equivalent means foreffecting a crushing or preliminary grinding of the grain while the sameis being delivered through the eye of the bed stone to the grindingfaces of the stones.

The stones are adjusted together by means of rods 33 which have theirends threaded to receive stop nuts 35 and fastening nuts 36, the nuts 35being disposed to engage the adjacent inner faces of the frames 4 and '5and space them apart while the. outer nuts hold the frames together.

are used two above and twobelow on each These tie rods side of thestones. By tightening up on these rods the frames can be adjustedtogether and locked with the grinding surfaces of the stones in abutmentthroughout, after which by unscrewing the set screw '17, the spring 26will tend to separate the stones for the distance determined by. the setscrew when they will run in true parallelism. They canbe easily adjustednearer, or fartherapa'rt as may be: desired. A casing 37surreundssthestones when the. mill is in operation and carries adischarge chute 38 whichis detachablyheld in position between theframes; g

The bed stone is mounted in a metallic sleeve 39 having longitudinalslots therein through which pass the bolts 40 by means of whichthesleeve and bed stone are fixedly secured to the frame 4. V r V In therear face of the running stone 20 I provide a plurality of radial slots41 open ing through the perimeter of the stone and having their outerends closed by a metallic band 42. Metallic plates 43 are inserted incurfs in the stone at the inner ends of the;

slot 41 and radial screws 44 are made fast at their ends to the plates43' and band 42. Adjustable balance weights 45. are threaded 'on thescrews 44-and by adjusting these radially thestone may haveits runningbalance preserved. To reduce its: friction the stone carries a bushing46 secured thereto and adapted to receive the mandrel 18. 4

In' operation, having dressed the stones when in the position as shownin Fig. 2,

the frame 4 and 5 are swung to the position'shown in Fig. 1, the bolts33 are insertedto draw'the frames together,the set screws- 17having'been run in to move the mandrel and running stone inwardly.After- 7' I the frames have been coupled up in the manner described, thespring 26 is applied to the extension mandrel and thescrew 17 is turned"to permit the stones to separate the desired distance thereupon the millis.

ready for operation. The grain is delivered between the cone and concaveto be preliminarily crushed and then'passes radially outwardly betweenthe stones, in which passageits grinding is completed. 7

The convenience of my frame work for taking the mill'apart and moving itwill be obvious as the base and each frame 4 or 5 canallbe separated andhandled conveniently. which is a great advantage, particu-..

larly in mills for country use.

Having thus described my invention, what I claimias new and desire tosecure by Letters Patent, is

ion

1. In a vertical grinding mill, a running" stone carrying a crushingcone rigid therewith, ,a bed stone having 'a concave bur rigid therewithand adapted to receive said cone,,a bed plate, a separate frame supportforeach stonehinged to said bed plate, ,tele

scoping mandrels carried by said frame supports and meansto permit saidstones to be shifted apart sufficiently to disengage the mandrels andpermit the cone'to clear the concave as thefstone frames swing apart ontheir hinge connections to said bedplate.

2. In a vertical grain:grindingmill, the combination with a bed stoneand its hinged support, of av running stone audits hinged support, adriving mandrel for the running stonehich extend ,t rethr gh. nd int theeye of the bed stone, an extension manadapted to move apart sufficientlyto dis- 10 drel detachably connected to said driving connect themandrels andpermit the stones mandrel, bearings for said mandrels, a toswing With their supports to horizontal spring acting to press theextension manposition drel toward the running stone, at set screw Intestlmony whereof I aflix my signature.

to hunt the movements lmpaited to the ASBERY T. HARE mandrels andrunning stone by said spring and to hold the stones in predeterminedWitness:

running position, the stone supports being NOMIE WELSH;

Copies of this patent may be obtained for five cents eachfby addressingthe Commissioner of Patents, Washington, D. G.

